diff --git "a/\344\270\201\347\264\253\345\246\215/20220524-\345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237.md" "b/\344\270\201\347\264\253\345\246\215/20220524-\345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237.md"
index 3dd13bdaa48ee1c1d6fd90246c41be38476da58f..1e27684d75582fc4055ad9a1bb592d6130656a3c 100644
--- "a/\344\270\201\347\264\253\345\246\215/20220524-\345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237.md"
+++ "b/\344\270\201\347\264\253\345\246\215/20220524-\345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237.md"
@@ -162,7 +162,7 @@ $ret = mysqli_query($conn,$sql);
 if($ret){
     echo "删除成功！<a href='./index.php'>返回首页</a>";
 }else{
-    echo "修改失败！";
+    echo "删除失败！";
 }
 ```
 
diff --git "a/\344\270\201\347\264\253\345\246\215/20220525-\344\274\232\350\257\235\346\212\200\346\234\257.md" "b/\344\270\201\347\264\253\345\246\215/20220525-\344\274\232\350\257\235\346\212\200\346\234\257.md"
new file mode 100644
index 0000000000000000000000000000000000000000..2ac3adf60f6494bcf9c67065f751c3d066fc6039
--- /dev/null
+++ "b/\344\270\201\347\264\253\345\246\215/20220525-\344\274\232\350\257\235\346\212\200\346\234\257.md"
@@ -0,0 +1,159 @@
+```html
+<!--login.html-->
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>学生管理系统登录</title>
+</head>
+<body>
+<h1>登录界面</h1>
+<form action="login.php" method="post">
+    <table border="0" cellpadding="" cellspacing="">
+        <tr>
+            <td>用户名：</td><td><input type="text" name="username" ></td>
+        </tr>
+        <tr>
+            <td>密码：</td><td><input type="password" name="password" ></td>
+        </tr>
+        <tr>
+            <td></td><td><input type="checkbox" name="auto" value="yes">7天内自动登录</td>
+        </tr>
+        <tr>
+            <td><input type="submit" value="登录"></td>
+        </tr>
+    </table>
+</form>
+</body>
+</html>
+```
+
+```php
+<!--login.php-->
+<?php
+session_start();
+$username='admin';
+$password='123456';
+if ($_POST['username']==$username && $_POST['password']==$password){
+    echo "登录成功";
+    $_SESSION['username']=$username;
+    if ($_POST['auto']=='yes'){
+        setcookie('username','admin','time()+60*60*24*7');
+    }
+    echo "<a href='index.php'>返回首页</a>";
+}else{
+    die("登录失败");
+}
+
+```
+
+```php
+//连接数据库
+<?php
+error_reporting(E_ALL^E_WARNING);
+$conn=mysqli_connect("localhost","root","root","student") or die("连接失败");
+mysqli_query($conn,'set names utf8');
+```
+
+```php
+<!--//loginout.php-->
+<?php
+session_start();
+unset($_SESSION['username']);
+setcookie('username','',time()-1);
+echo "注销成功";
+```
+
+```php
+<!--index.php-->
+<?php
+session_start();
+$user = $_SESSION['username']?:$_COOKIE['username'];
+if(isset($user)  && $user=="admin"){
+    echo "学生管理系统首页";
+    echo "欢迎您：".$user;
+    echo "<a href='loginout.php'>注销</a>";
+    echo "<a href='change.php'>管理员界面</a>";
+}else{
+    echo "你还没有登录！<a href='login.html'>马上去登录</a>";
+
+}
+```
+
+```html
+<html>
+<head>
+    <title>添加学生数据</title>
+</head>
+<h1>添加学生数据</h1>
+<form action="update.php" method="post">
+    <table border="1" width="400">
+        <tr>
+            <th>学号</th><td><input type="text" name="id"></td>
+        </tr>
+        <tr>
+            <th>姓名</th><td><input type="text" name="name"></td>
+        </tr>
+        <tr>
+            <th>成绩</th><td><input type="text" name="score"></td>
+        </tr>
+        <tr>
+            <td colspan="2" align="center"><input type="submit" value="提交">&nbsp;
+                <input type="reset" value="取消"></td>
+        </tr>
+    </table>
+    <a href="index.php">返回首页</a>
+</form>
+</html>
+```
+
+```php
+<?php
+include_once ("./connect.php");
+if(!isset($_GET['id'])){
+    die("非法访问！");
+}
+$id=$_GET['id'];
+$sql = "select * from `user` where `id`=$id";
+$result = mysqli_query($conn,$sql);
+$row = mysqli_fetch_assoc($result);
+?>
+<html>
+<head>
+    <title>修改数据</title>
+</head>
+<h1>修改数据</h1>
+<form action="update.php" method="post">
+    <table border="1" width="400">
+        <tr>
+            <th>学号</th><td><input type="text" name="id" value="<?php echo $row['id'] ?>"></td>
+        </tr>
+        <tr>
+            <th>姓名</th><td><input type="text" name="name" value="<?php echo $row['name'] ?>"></td>
+        </tr>
+        <tr>
+            <th>成绩</th><td><input type="text" name="score" value="<?php echo $row['score'] ?>"></td>
+        </tr>
+        <input type="text" name="id" value="<?php echo $row['id'] ?>" hidden>
+        <tr>
+            <td colspan="2" align="center"><input type="submit" name='submit' value="提交">&nbsp; <input type="reset" value="取消"></td>
+        </tr>
+    </table>
+    <a href="index.php">返回首页</a>
+</form>
+</html>
+```
+
+```php
+<?php
+include_once('connect.php');
+$id=$_GET['id'];
+$sql = "delete from `user` where id=$id";
+$ret = mysqli_query($conn,$sql);
+if($ret){
+    echo "删除成功！<a href='./index.php'>返回首页</a>";
+}else{
+    echo "删除失败！";
+}
+```
+
